Pega does not back test our older version of software to the latest 3rd party components. What is your use case? Connect-JMS or Connect-MQ or else? That being said, the fact that you stuff works for MQ 7.x suggest it may work for MQ 8. You should test it out first and see if there are any issues. We will help as much as we can but reserve the right not to support if there is major effort involved.