My $.02: Toyota has seen fit to produce the same fitting for oil filters for multiple engines. My 4Runner uses the same connections for both the V6 and V8. The difference in filters is the length of the filter (about an inch, IIRC). The diameter is the same. Bosch knows this info, and has decided the same filter would work fine on both vehicles (check the part numbers for both). Keeping in mind the other information posted (quality of oils and manufactured engines, etc), Bosch is are most likely correct.
If it bothers you, you can use the filter from the dealer. Personally, I use the V8 filter on my V6 - and have since new (now at just over 152K) with no ill effects. Since both filters cost the same, it costs me zero more to stick with the larger filter. I’m likely not gaining anything, and I understand that. It does make me feel better, though, and to me, that’s important.