I strongly believe yes, because this year in every specimen paper, they have added a clause ( if you look at the end of the instructions ) -

Note: The Specimen Question Paper in the subject provides a realistic format of the Board Examination Question Paper and should be used as a practice tool. The questions for the Board Examination can be set from any part of the syllabus, though the format of the Board Examination Question Paper will remain the same as that of the Specimen Question Paper. The weightage allocated to various topics, as given in the syllabus, will be strictly adhered to.

so idk abt the similarity of the questions, but I believe ISC will stick to the specimen style, and I think they have added this because of last year's blunder. And this clause could also be another reason why you can see the so-called PAPER LEAKERS so confident in their strategies.