work/travel Question: Can you have the Pfizer/Moderna vaccine if you've had the AstraZeneca before?

I have to travel to the US to do a project for work in the third quarter of next year for a project I originally started in very late February in NYC but which was then cancelled due to Covid. I have received a letter from authorities telling me I will have to have an 'mRNA vaccine'.

I am a 65 year old male in generally good health and live in the UK.

I'm in the 5th Category (according to UK organisers) to get the vaccine. They only have the Pfizer one just now with 'emergency approval' and are currently vaccinating people with it. I fear by the time they get round to me - say, February / March - that I may well get the AstraZeneca/Oxford one. I know I will need a mRNA shot to fulfil the authorities' request. (I assume this is because of the questions raised by the AstraZeneca trials - which is certainly fair - most definitely for someone my age because only 12% of people my age were involved in their trial - only 4% over 70. I'm praying they just may make it - i.e., the AstraZeneca/Oxford vaccine - for under 55's. )

In any case I will need to get an mNRA vaccine - with which I'm fine with. My question - which I can't seem to get anyone to answer - at least so far - is this:

If I was to get the initial AstraZeneca (Vector) vaccine ... could I still have an mRNA one (say either Pfizer or Moderna)??? Would it be safe to do so? Or are you restricted to one kind of format once you've had it originally??? Any one know how long should be between the two shots? I'm thinking about three months - as that is the minimum length that theyseem to think those who have endured Covid have substantial antibodies following - or so I've read.

Any advice you can offer me in terms of this will be HUGELY appreciated. I have been pondering this for days.

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