Are the seats in a 1994 Mercedes SL 500 Roadster the same or softer in a 1993 Mercedes 500 SL Roadster?

I bought a 1992 300SL and the seats were so hard that I thought something was wrong. So I went to a showroom and sat in the seat of a 1998 500SL, same hard seats. To remedy the problem I had my upholstery specialist take my seats apart and replace the German horsehair/hard rubber fabric with modern foam rubber. The seats are much more comfortable now but not as comfortable as my Volvo. The Volvo also has cup holders, the Mercedes does not, which helps understand the hard seats.