I think a RH players pendulum serve ( clockwise as MK73 quotes) is generally classed as a FH dominant serve. The spin, when received by a RH opponent, on their BH can pull the return to the servers left side (BH) side.
server steps around and plays FH, opening up the table, which allows them to play more FH’s as they work back across the table left to right. Of course an open table can be exploited by a skilled opponent, so quality of servers 3rd ball attack needs to be good.
In general it can be easier to return a right handed pendulum serve by a right handed receivers FH, just more controlled, main issue is reading back or top spin, the side spin is watered down a little.
So if you serve short pendulum to a RH players FH side they are likely to be able to position the return better if they read the back or top spin variation.
Serving to receivers centre line reduces the angles available, also applies to open play.
A reverse pendulum, hook/punch, tomahawk serve or standard BH serve of a righty are classed more as BH dominant. Reason is the Anti clockwise spin pulls the ball to the servers right side (FH side) of the table, sure a FH 3rd ball is on, but the table is now open on the left hand side, meaning it’s more likely that you will have to work back across the table right to left, unless you are super fit and fast, this means playing more BH shots.
As MK73 pointed out, diagonal serves are also more likely to be returned cross table, more table available diagonally for receiver to return into. So you can serve BH or reverse pendulum etc from left side into receivers backhand, but again, a return of anti-clockwise spin serve with a righties BH is easier for them to deal with the side spin. It’s top, back or no spin that is then what they have to pay more attention to.