Possibly found a new tile size!

I think I am going to have to move to a larger size tile. Apparently, all suppliers are doing away with the 4 x 4 size tiles that are solid, sturdy, frost proof PEI 5.  That just stinks!  But what can you do??? I am trying out a porcelain thru body 6 x 6 tile.  They are a monster to drill through...but, that just means they will not crack or freak out in frozen winters up north! I sell the majority of my address tiles to people up north...so this is an important factor to me!

This is my first set on the 6 x 6.  I would like to know if anyone can tell they are larger?? Here- this pic below is an old 4 x 4 tile...Can you see a difference just by looking at the picture?

I ask...because I have all of these great pictures that are 4 x 4...can I use them to show designs for the 6 x 6???

What do you think???