Temperature discrepancy

Hi,

I am modeling a simple conduction problem in solids. When I model my geometry as a unified body, I get a maximum temperature of 358. But when I split my geometry into subdomains and define a heat transfer in solid for each of them, I get 362 for maximum temperature! I think that the problem lies in how comsol treats the common boundary between subdomains. If it assigns a coupled temperature to these boundaries, the result for two simulations should be similar. Any ideas about this issue?

Thanks.