You can really do it on either synth. I was buried in the studios creating those 80's sounds with a Rev 3.0 P-5 back in the day. Several years ago, I got back into synths and got a P-08. I was and still am very pleased with the sounds I can get, including emulating those 80's sounds. The P-6 is also a worthy successor to the P-5. However, my preference is the P-08 because of the added features. I think that Dave Smith also corrected what I considered sonic deficiencies on the P-5. The P-6 carries these forward (generally a less bright sound). Some covet the darker sound. I feel it was a deficiency.
The sounds you want to create are pretty straight forward. The trick with the P-08/Rev2 is not resorting to the additional modulation capabilities it has. Stick with the basics. The only real difference is that you have to back off the cutoff filter a little more on the P-08 than the P-06 to replicate the sound.
If you examine the P6 vs. the Rev2 closely, you will hear some sonic differences. However, once they are placed in a band situation or a recording mix, the differences become inconsequential.