Warning: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in ..../includes/class_bbcode.php on line 2968 Difference in hp/mp for pre-made DB
At first there was a massive HP difference because you missed out on a few advancements, but that was fixed. The only thing you "lose out" on now would be 20 levels of HP washing (if you wanted to do that).
There will be a minimal MP difference, but other than that, you'll be fine starting at 30.
When they were released in GMS, they didn't get the HP from the first two job advancements, so they were missing like...600 hp. It was fixed after about a week of them being released though.