"Twin" grids

[Hitch75]

This is a bit complicated to explain...

Let's say we have two tables: A1-D5 and F1-I5.
Both tables' first column and row are marked with letters or numbers, so that every cell inside B2-D5 and G2-I5 have their "coordinates".
They are the same in both grids, for example, 123-ABC, 123-ABC.
(A1 and F1 are empty).

Now, I'd like to set a "connection" between these two grids, so that every cell refers to it's "twin" cell in another grid, which takes the same coordinates.

Let's say, we need the double values in the right grid (if C5 is 8, H5 would be 16) but without determining each cell's reference. So, I need a universal formula, the same one in all cells, which will check out it's own position inside the grid, find the same position in the other grid and calculate it's double value.

I'd really appreciate your help!

Thanks!

[shg]

In F1 and copy right and down, =2*A1