How is notation done for similar pieces capturing the same piece? When a capture can be made by two rooks, or two knights, etc., how does the notation clarify which piece makes the capture?

For example, if two pawns, one at e4 and one at c4, capture a pawn at d3, the notation will say exd3 or cxd3, sure.  But if two knights capture the same piece, how is that notated?  Or for two rooks, or queens?  In the case of the knight, it would only say Nxd3, but that doesn't clarify which knight took the piece.
Your two knights are on d2 and f2.

Ndxe4, Nfxe4,


Your two knights are on f2 and f6.

N2xe4, N6xe4


Your three knights are on d2, f2 and f6 (you promoted a pawn)

Ndxe4, Nf2xe4, N6xe4