Shuffle Chess vs Fischer Random

I am safe to say that the main difference between Shuffle chess and Fischer Random (Chess 960) is that with Shuffle Chess there is no castling and the bishops can start on the same colour depending on the drawing order of the pieces?

I think the rules to shuffle chess have not been set in stone, but...usually, it's required that the players get one dark squared B and one light squared one.  And castling is either not allowed or allowed only when the K and R are on the traditional starting squares.

Chess 960 is shuffle chess that allows castling regardless of the starting position and requires the K to be somewhere between the Rs.

There are 960 starting positions in chess 960 (no kidding!), and 2880/2 = 1440 starting positions in shuffle chess (I divided by 2 because half of the positions are mirror images of the other half).

Adding the 960 castling rules to shuffle chess would result in chess 2880, because there would then be no mirror images.  See here.

I assume that in Shuffle Chess, if the King started on E1 and the rook was on H1, Kingside castling would be permitted. If the other rook started on C1, Queenside castling would not be permitted.

From my understanding in Shuffle Chess, the King does not have to be between the two rooks to start the game as in Chess 960 (Fischer Random)

I tried to play shuffle chess on "Arena" chess gui, and it seems that bishops can't be in the same color, and castling isn't possible no matter where the king and rook are located.