Thanks for your interest on our tiles.

The main difference is the chip or pixel size. Silver Spoon has chips 3/8"x3/8" vs Frozen which has 1"x1" pixels. The pixels in silver Spoon are more dense so you will not see any joint thickness, where in Frozen the joints are 1/16" .

The only other difference is that Silver Spoon has some random shiny pixels which you can't see in Frozen. Thank you!

Which ones of these (if any) don't need grout?

Silver Spoon has more dense pixels, so the grout is not needed at all.

Frozen you can grout it, but most of our customers haven't added any grout to keep the shine of tiles.