spark plugs for Mk.2.5 Are BKR6E OK?

 Having a clear out the other day and found a set of unused plugs, must have been in a drawer for years!  They are BKR 6E  I don’t see any reason why I should not use them in my Mk.2.5 instead of the BKR6E-11 providing I gap them at 1.1mm. Or does anyone know of any reason  why or if they would be unsuitable?  Any comments would be most welcome.

             Regards   Geoff Peace.