No, everything is ok with 16mb-versions and with their scores. I have in my collection TNT 16Mb, TNT2 Vanta 16Mb, TNT2 M64 16Mb, TNT2 16Mb, TNT2 Pro 16Mb, and tested all of them in 2001 with same default settings as 32Mb-versions - if you use correct drivers, there will be no problems.