The blue can defintely vary from strain to strain, breeder to breeder, and even fish to fish. Many also tend to look silvery, or washed out, due to camera flash, and sometimes the lighting used in the tank. IME they are a difficult fish to capture the true colors of unless you own some premium camera equipment, and know how to use it. As an example, here's a TS from a couple of years back shortly after these fish first surfaced in the USA. Same fish, but quite a difference between the first shot taken out of the water, and the rest of the pics taken in the tank.
http://www.monsterfishkeepers.com/forums/showthread.php?250748-3
Now you have some newer strains, some deeper blue in color, and in some the overall nuchal hump size appears to have been developed further as well. All this equates to is more inbreeding/line breeding to fix certain traits. Titanium, Blue Diamond, etc are nothing more than trade names that some Asian breeder or vendor has used to add some new sex appeal to their fish. In the beginning Channacrossbreeds called his Thai Silk, and Lakefishex called his Platinum. Those were the two original vendors that offered them up for sale.
When these fish first surfaced 3-4 years ago you couldn't buy a Thai Silk with a clean bill of health if your life depended on it. If you bought direct from Thailand it cost $150 + transhipping fees for a 2-3" fish, and the vast majority of people on MFK that bought them, lost them shortly after to hex/spironucleus etc.
Back then (late 2008/early 2009) most vendors on aquabid listed 4-5" Thai Silk in the $300 range.
Today you can buy juvies for $20 a fish, less if you buy in quantity, but like all FH the larger in size and the greater the potential the fish has, the higher the price tag.