what is the diffrence

The new LP mastering FX are Platinum exclusives.
edit: Not sure about this, I was going by the Rolling Updates page which disagrees with the documentation.

There is often content that is release exclusively to Platinum members at the time of release.  I forget what was specifically done last year, maybe some loops or something.

Ya there's a bunch that's exclusive. The list in on this page but in terms of Pro vs Platinum briefly:
 
Drum replacer, vocal sync, console emulator, mastering plugins, dimension pro full, and a bunch more 3rd party content.

I dunno, seems pretty clear to me of you look at the charts. Look at the dots in the Pro group, then look at the dots in the Platinum group. Any time there's a dot in the Platinum group not in the Pro group, that's something that is Platinum exclusive. It is, as with most audio software, down to included plugins since Cakewalk doesn't artificially limit things like track counts. Platinum comes with a number of additional Cakewalk plugins, and a number of additional third party plugins.
 
If you already paid for Platinum there would be very little reason to drop down to pro as the renewal price isn't much difference. If you have Pro and are thinking about upgrading to Platinum it is pretty easy to see what additonal toys you'd get.

The mastering effects are in pro, just another location.

For me, a lot of the items in splat I already have from former versions. That was the deciding factor in my case. Different people, different needs. For me, I will set the extra money aside and save for really nice plugs or new interface. Sonar IS very versatile.

Thanks Craig,
I'll recheck the posts I saw. I thought it was from the Baker's stating that one was in the mastering suite in plat and somewhere else in pro. I already own ozone 5. Haven't totally learned that yet. So many programs.😎

Even though I am a SPLAT user, I remember that the only difference between the TOP package and next to top package was the added 3rd Party freeware. I made this jump a long time ago from a STUDIO to PRO version of SONAR at an offer price I couldn't refuse.  I think it cost me $49 to convert, so I went for it.
 
So, if you have all the plugins and sample libraries already, there was little need to update to SPLAT.  I thought that the add-ons might save me from upgrading and/or purchasing new plugins, I have found that "most" of the added software from CAKE was "jr" versions of the software and that if I liked the product I wound up buying the full version anyway.
 
So that is that and Splat is Splat.  I still am satisfied with my SPLAT even though I don't get much extra for it.
 
Jim