Yup - Beck/Arnely makes many OEM parts - should be OK to use, but hopefully runs close to its temp rating and not much cooler. TRD makes a performance one for our engines that runs at 160F - but needs the ECT repalced and ECM reprogrammed (if possible) to understand a cooler thermostat.
As for the the Prestone 150K mile long life - the only one that I know of it the DEX-COOL stuff. I hope it is not that coolant, as it cannot be mixed with Toyota Red (not sure with Toyota Pink - but I will assume it will also be the case with that).
We had a few cars come through the shop with a mix of DEX-COOL and Toyota Red - water pumps were pitted and heatercores were clogged. Their additive packages don't work the same way - if mixed, the anti-corrosion additive packages work against each other and you may get less protection (ie, if you take 60K mile coolant or one type and mix with 150K coolant of another - the resultant mix may not even last 30K miles + make "mud" drop out of solution). The DEX-COOL also reacts very strongly to entrained air in the cooling system - that way the service manuals all point to getting as much of the trapped air out before normal operation, otherwise it takes that telltale brownish color instead of the usual orange (GM OEM) or green (Prestone). Granted. tt is OK to use a different coolant, though it has to be compatible with the cooling system, but they highly recommend that you flush the old type completely out of the system and replace with the new type of coolant.
Since you only add it to the overflow tank - you probably are OK, as not much would have been pulled into the cooling system under normal operation (assuming that there was no loss of coolant at any time). Others have said it is OK to mix them - some say no way.
I go by the book, and the book says NOT to mix them. I also don't believe everything I read - so I went ahead and mixed them in a bottle and shook it up periodically. After a relatively little while, they will precipitate out (solids that form from solution, and fall to the bottom - basically they created that mud you sometimes see in an old, neglected cooling system).