No, they’re not the same—but they mean the opposite.
Buy USDJPY = you expect the USD to go up vs the JPY.
Sell JPYUSD (if shown that way) = also means you expect USD to go up vs JPY.
So, Buy USDJPY = Sell JPYUSD — they’re just flipped versions of the same idea.
Most platforms (like MetaTrader) use USDJPY, so just flip the signal direction if your provider uses the reverse order.