I'm afraid yes
ideally another Bengal but If you can't stretch to that as long as they are similar ages you should be fine.
As you probably know Oska's companion is Harvey who is a Maine Coon and someone else on here has just got an Abyssinian (not that either of these are much cheaper
)
So if you fancied a calming influence ! not that Harvey (who is meant to be a gentle giant)is very calm in fact Oska has taught him to spring which is very funny(something he will probably regret when Harvey is twice Oksas size
).
What I'm trying to say is that Oska and Harvey get on very well so don't feel that you have to get another Bengal any cat will do
Naomi