How realise a deviation map between to part?

Hello!

I know how to realise a deviation map via "analyse of the deviation" between a mesh and a surface made from my mesh, with the ScanTo3D module. But when i want to realise the same thing between a mesh and a STL from an other file, i can't because there are not on the same file, the only solution should be to put them togheter on the same file via an assembly but it didn't work... so if somone has an idea, it will be welcome!

thanks!

yoann

SolidworksSimulation