had.
Have you ever had the same experience as he had?
你有过和他相似的经历吗?
从句意思可知,他已经经获得这样的经历.所以用had>
as 引导限制性定语从句,主要用于the same…as（与……相同）,such…as（像……一样）,as…as（与……一样）.通常主从句的时态是一致的.
如：She knew he felt just the same as she did.她知道他的感受和她一样.Such a man with a good temper as Mr.Li is is easy to get along with.像李先生这样好脾气的人是容易相处的.He smokes as expensive a cigarette as he can afford.他抽一种他买得起的最贵的烟.