Duplicate Schemas side by side

I have two schemas that share the same root node and target namespace. One exists in a .NET 2.0 assembly the other in .NET 1.1 (BizTalk 04) – these assemblies are versioned 1.1.0.0 & 2.0.0.0 . I have an older orchestration (BizTalk 04) that receives one of these messages via a request-response port, however, when it receives the message it appears to automatically default to the 2.0.0.0 version even though it references the the older 1.1.0.0 assembly and therefore throws the exception below. Is there a way to run these side-by-side without changing the root node or target namespace?

Message : Received unexpected message type ‘SARB.Interface.Common.Schemas.WINS.WINSResponseSchema, SARB.Interface.Common.Schemas.WINS, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b593e508e47f3a3e’ does not match expected type SARB.Interface.Common.Schemas.WINS.WINSResponseSchema, SARB.Interface.Common.Schemas.WINS, Version=1.1.0.0, Culture=neutral, PublicKeyToken=b593e508e47f3a3e’.