TDP doesn't say much about power consumption really. Indirectly yes, but thats all. The products usually fall into certain categories by their TDP, e.g. 9 W, 14 W, 19 W, but that just means that they use the same cooling solution and that cooling solution is designed to dissipate that much of heat without letting the chip being cooled to reach it's maximum junction temperature set by the manufacturer. We can with probability say that a part with TDP of 10 W will consume more than a part with TDP of 6 W, but we can not be certain of it. TDP does not prove it any way. For example it could be possible that for some unknown reason the manufacturer slapped a higher TDP for the part just to make sure it runs cooler.