Hard to say on those two turbos. He just uses a generic picture.
If nothing else my info can go as an fyi for you.
The numbers just seem close and on that auction the S400 (S366XL) based charger is more expensive than the S300 (s366) based charger?
I would only use bullseye if you need something with a custom housing, and do your homework to make sure you can't buy the same turbo off the shelf for less money. My
.