Although both blades are produced under the Personna brand, the "Med Preps" are produced by Accutec Blades in Verona, VA, the only blade producer remaining in the USA.
The Persona Platinum Chrome blades are now produced in Solingen, Germany in the same facility that produces the Wilkinson Sword Classic blades. These blades were formerly produced in Israel and were known fondly as Israel Reds. I have tried a few of the German blades and consider them to be essentially identical to the Israeli blades, but other seem to think the Israeli blades were better.
Although I have tried the Persona Comfort Coated "Lab Blues" made by Accutec, I have not tried the Med Preps. I find that the PTFE coating on the Lab Blues is too thick for a comfortable first shave. Once the coating wears off I find they are similar in performance to the the Platinum Chrome. Thus, I prefer the Platinum Chromes. They are among my favorite blades. I am not certain how the Med Preps differ from the Lab Blues.