NS-> ContentFormatter -> Custom Formatter assembly cached???

Hi guys,
I have one Notification Services (in MSSQL 2005) and two Application in it.
Each Application has ContentFormatter with different Custom Formatter.
(assemblies are in different folders)

Code Snippet
...................

<ContentFormatter>
<ClassName>NS.NotificationFormatter.CustomFormatter</ClassName>
<AssemblyName>c:\1\NS.NotificationFormatter.dll</AssemblyName>

...................

<ContentFormatter>
<ClassName>NS.NotificationFormatter.CustomFormatter</ClassName>
<AssemblyName>c:\2\NS.NotificationFormatter.dll</AssemblyName>

...................

So when I call Custom Formatter (1) it look like cached in server, because
when I call Custom Formatter (2) instead this Custom Formatter (1) invoked
(from cache). But it has different assembly, so error occur.

Help me please.