No it isn't, nor is it like saying a Saab 9000 (either CC or CS/CD) ia an Alfa 164, or a Lancia Thema, or a Fit Tempra.
A Saab 9000 whether in the CC early model, or the Later split CD and CS based models is no different. It is an Evolution rather than a rebirth.
The C900 is a totally different animal to the NG/GM900 and the C9-3 (yes this applies), because the GM900 and the C9-3 are based on the Cavalier/Vectra platforms and share a body shell shape, where as the C900, only has a similar engine to the others, but a near unique engine/transmission layout that it only shares with the 99. Remember different body shells and design tweaks is a Saab standard.
Saab 99 3 and 5 door hatch and 2 and 4 door sedan/saloon. Saab C900 in 3 and 5 door hatch, 2 and 4 door saloon/sedan and 2 door convertable NG/GM 900 sam Saab 9000 CD 4 door Saloon, and CC/CS 5 door hatch with facelift.