Would a 60mhz 46 inch LCD TV produce less quality video than a 60mhz 40 inch LCD TV?

After custom setting the video based on my preferences on a 40 inch LCD TV with 60mhz cycle, we watched the last Harry Potter film and then Phantom of the Opera, both in Blu-Ray discs. The video quality was great, perfect for me with its lush, vibrant and crisp contrast and colors.

Wanting more screen size, we exchanged the 40 inch with a 46 inch. Same brand, same model line. When I duplicated my preferred custom video settings however, I couldn’t get the same rich and satisfying video quality that I got from the 40 inch.

Did I make the mistake of assuming the 46 inch would perform as well as the 40 inch when it just plain couldn’t since they both run on mere 60mhz cycles? Would there be any way for me to compensate at this point? We really prefer the bigger screen. Thanks!