3ds Max :: Material Scaling In Linked Models

I'm using Max Design 2013 to render Revit models.

Linking the RVT file into max works well and all materials are scaled visually as expeected. The problem comes with replacing materials.

I'm working in Metric files in MM.

As an example I've got a wall in Revit with Brick, Common material attached, The image file used is Brick_Non_Uniform_Running_Burgundy.png which is 5 bricks wide x 16 brick courses tall. When rendered this look correct on the model.

However, I;ve I drop another Autodesk brick material onto the wall in Max the scaling is messed up. When I've noticed is that the scale on the Bitmap in Max of the Revit material is 3.33mm x 3.89mm The scaling of the bitmap of the Max material (same numbers of bricks) is 1016x1187mm.

Whats going on between Revit and Max that causes this behavior?