No, EASA regulations require that the amount of credit shall be determined by the competent authority on the recommendation of an ATO, which is not quite the same thing.

In the case of the IR, the UK CAA has determined that any recommendation of 15 hours or more may be assumed to be acceptable but the full recommendation/approval process will have to be followed in the case of a CPL or FI. Article 8(3) of the Aircrew Regulation refers.

Under EASA the HT recommends the amount of training required to the authority, based on a checkride taken before the training starts. A training program should obviously be based on the skills of an applicant and not be a standard package for everyone where an experienced captain does the same amount of training as a newly minted CPL.
The fact that the UK CAA still insists (if true ) on a minimum of 15 hours of training this would be protectionism and conflicting with EASA regulations as all rules and regulations are uniform for training throughout the EU under EASA. So if you do a conversion do it in a EASA state that respects the rules and regulations of 1178/2011 and bases the training you require on your skill level.