Pharmacy & Biomedical Engineering - Cardiff, Nottingham, Leicester, Loughborough, orA

What are your predicted grades, and which is your aspirational choice and your Insurance choice for MPharm.
And why are you applying for two different subjects? Have those two Unis agreed to accepting a different PS?

Uni's typically allow you to send them a personal statement that's different from UCAS. I sent mine to Loughborough via email. Aston asked me to send mine in a PDF file!

This is very risky as many Universities do not allow this - and many would have simply rejected your application with a clearly 'wrong' PS that indicated a lack of commitment to to their subject.

That may be true, I think they may have been more lenient as I mainly applied for medicine and not all of your choices on UCAS can be med

Its is entirely different for those applying to Med/Dent/Vet as all Unis know that one of their five choices will have to be for a different subject.
The OP is not applying for any of these courses, and therefore Unis will not be 'understanding' but may instead interpret this as an applicant with muddled ambitions and a lack of commitment to either course - hence my use of the word 'risky'.