You should be fine for the time being, both mixtures are designed to do the same job even though they consist of different compounds. These days I'd recommend Halnziye HY810 or HY880 if you are just needing something you can get in large quantity with decent properties (4.63W/m-K and 5.15W/m-K) but if you are looking for some real high grade stuff go with Halnziye HY-A9, this stuff is 11W/m-K and is dirt cheap. Remember that all thermal pads and pastes with the same thermal rating will all perform very similar the rest of it is just branding and packaging you are paying for.