No, the red dipstick in a 1998 Pontiac Grand Prix GT with a 3.8L engine is
almost certainly for the engine oil, not the transmission fluid. Automatic transmissions in those vehicles typically do not have a dipstick for checking fluid level. The transmission fluid level is checked and topped off by a qualified mechanic using special equipment to access the fluid level.
Trying to add transmission fluid using a guesstimate method is strongly discouraged, as it could lead to serious damage to the transmission.
