diff --git a/crates/voicevox_core/src/infer/status.rs b/crates/voicevox_core/src/infer/status.rs
index bef8889d3..db529e2e5 100644
--- a/crates/voicevox_core/src/infer/status.rs
+++ b/crates/voicevox_core/src/infer/status.rs
@@ -184,7 +184,6 @@ impl<R: InferenceRuntime, D: InferenceDomain> LoadedModels<R, D> {
     /// 次の場合にエラーを返す。
     ///
     /// - 音声モデルIDかスタイルIDが`model_header`と重複するとき
-    /// - 同じ`speaker_uuid`で、スタイル以外でプロパティが異なっている話者があるとき
     fn ensure_acceptable(&self, model_header: &VoiceModelHeader) -> LoadModelResult<()> {
         let error = |context| LoadModelError {
             path: model_header.path.clone(),
@@ -194,13 +193,10 @@ impl<R: InferenceRuntime, D: InferenceDomain> LoadedModels<R, D> {
 
         let loaded = self.speakers();
         let external = model_header.metas.iter();
-        if let Some((_loaded, _external)) =
-            iproduct!(loaded, external).find(|(loaded, external)| {
-                loaded.speaker_uuid() == external.speaker_uuid()
-                    && !loaded.eq_except_styles(external)
-            })
-        {
-            todo!("same `speaker_uuid` but different properties");
+        for (loaded, external) in iproduct!(loaded, external) {
+            if loaded.speaker_uuid() == external.speaker_uuid() {
+                loaded.warn_diff_except_styles(external);
+            }
         }
 
         let loaded = self.styles();
@@ -252,7 +248,7 @@ impl<R: InferenceRuntime, D: InferenceDomain> LoadedModels<R, D> {
         Ok(())
     }
 
-    fn speakers(&self) -> impl Iterator<Item = &SpeakerMeta> {
+    fn speakers(&self) -> impl Iterator<Item = &SpeakerMeta> + Clone {
         self.0.values().flat_map(|LoadedModel { metas, .. }| metas)
     }
 
diff --git a/crates/voicevox_core/src/metas.rs b/crates/voicevox_core/src/metas.rs
index 8cd67c976..ae47e1803 100644
--- a/crates/voicevox_core/src/metas.rs
+++ b/crates/voicevox_core/src/metas.rs
@@ -1,10 +1,11 @@
-use std::fmt::Display;
+use std::fmt::{Debug, Display};
 
 use derive_getters::Getters;
 use derive_new::new;
 use indexmap::{IndexMap, IndexSet};
 use itertools::Itertools as _;
 use serde::{Deserialize, Serialize};
+use tracing::warn;
 
 /// [`speaker_uuid`]をキーとして複数の[`SpeakerMeta`]をマージする。
 ///
@@ -118,7 +119,10 @@ pub struct SpeakerMeta {
 }
 
 impl SpeakerMeta {
-    pub(crate) fn eq_except_styles(&self, other: &Self) -> bool {
+    /// # Panics
+    ///
+    /// `speaker_uuid`が異なるときパニックする。
+    pub(crate) fn warn_diff_except_styles(&self, other: &Self) {
         let Self {
             name: name1,
             styles: _,
@@ -137,8 +141,30 @@ impl SpeakerMeta {
             style_order: style_order2,
         } = other;
 
-        (name1, version1, speaker_uuid1, speaker_order1, style_order1)
-            == (name2, version2, speaker_uuid2, speaker_order2, style_order2)
+        if speaker_uuid1 != speaker_uuid2 {
+            panic!("must be equal: {speaker_uuid1} != {speaker_uuid2:?}");
+        }
+
+        warn_diff(speaker_uuid1, "name", name1, name2);
+        warn_diff(speaker_uuid1, "version", version1, version2);
+        warn_diff(
+            speaker_uuid1,
+            "speaker_order",
+            speaker_order1,
+            speaker_order2,
+        );
+        warn_diff(speaker_uuid1, "style_order", style_order1, style_order2);
+
+        fn warn_diff<T: PartialEq + Debug>(
+            speaker_uuid: &str,
+            field_name: &str,
+            left: &T,
+            right: &T,
+        ) {
+            if left != right {
+                warn!("`{speaker_uuid}`: different `{field_name}` ({left:?} != {right:?})");
+            }
+        }
     }
 }