diff --git a/moto/elastictranscoder/responses.py b/moto/elastictranscoder/responses.py
index 99fc116c6d76..50e7588cc84b 100644
--- a/moto/elastictranscoder/responses.py
+++ b/moto/elastictranscoder/responses.py
@@ -4,6 +4,7 @@
 
 from moto.core.common_types import TYPE_RESPONSE
 from moto.core.responses import BaseResponse
+from moto.utilities.utils import ARN_PARTITION_REGEX
 
 from .models import ElasticTranscoderBackend, elastictranscoder_backends
 
@@ -45,7 +46,7 @@ def create_pipeline(self) -> TYPE_RESPONSE:
         thumbnail_config = self._get_param("ThumbnailConfig")
         if not role:
             return self.err("Role cannot be blank")
-        if not re.match("^arn:aws:iam::[0-9]+:role/.+", role):
+        if not re.match(f"{ARN_PARTITION_REGEX}:iam::[0-9]+:role/.+", role):
             return self.err(f"Role ARN is invalid: {role}")
         if not output_bucket and not content_config:
             return self.err(
diff --git a/moto/ssm/models.py b/moto/ssm/models.py
index bde58b117ba1..9d114696b8c2 100644
--- a/moto/ssm/models.py
+++ b/moto/ssm/models.py
@@ -1187,7 +1187,9 @@ def __init__(self, region_name: str, account_id: str):
 
         self.windows: Dict[str, FakeMaintenanceWindow] = dict()
         self.baselines: Dict[str, FakePatchBaseline] = dict()
-        self.ssm_prefix = f"arn:aws:ssm:{self.region_name}:{self.account_id}:parameter"
+        self.ssm_prefix = (
+            f"arn:{self.partition}:ssm:{self.region_name}:{self.account_id}:parameter"
+        )
 
     def _generate_document_information(
         self, ssm_document: Document, document_format: str