I think the acl's are oem but use different metals and design, with better oil supply. I don't think you need to change them at 25,000 miles, as they should last if the tolerances are good.
Know your date of first use (on V5) and your know how it's tested. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/194133/Emissions_17th_Edition.pdf