the 12 core is rumored to clock faster, up to 5Ghz. That's the one Im aiming at. The CPU's will be released next moth so usually the rumors are very close to be true by now.
Just a side note. Zen+ supports up to 4000Mhz, but I only managed 3533 with absolute high end and ultra expensive memory (the fastest SAMSUNG B die at the time) with most people hitting 3200Mhz right now. So you shouldn't expect 5000, You should expect the 3600 on Zen 2 as a conservative estimate.