Is diagonistic test level of difficulty more or less same as real Gre

GRE General
1

I gave 3 diagnostic test , Two powerprep and one from Official gre book, i got score ranging from 312-315 in all 3 test, however i am still not sure if the diagnostic test has the same or less difficulty than the real Gre
Could anyone please clear this doubt?

Thank you

2

verbal is on par but math section might be a little more wordier than whats shown in the PowerPrep as the PowerPrep are not updated by ETS.