There is only likely to be a reaction if you have them both jabs at the same time or very close to each other. I cannot see how there could be any interaction after, say, a month, or even several weeks. By then the immune response would have been triggered in your body and any of the material used in the vaccine would have been excreted or otherwise absorbed into the body.
EllenVannin and others, there was only a temporary halt in the COVID programme while the case of someone on the programme became ill was investigated. It wasn't inevitable that if someone became ill it was vaccine related and eerything seems OK now because vaccination of volunteers is continuing. How do I know all this? DH is one of the volunteers, and his second jab was delayed for a week but he has now had i, of course we do not know whether he had the COVID jab or the control substance.. This Phase 3 (I think) involves 10,000s of people in countries all over the world and includes people like DH who is over 75, overweight and has Type 2 diabetes (in remission).
Others have made the point about what being licensed or not makes, and it is to a large extent a administrative formality. If a COVID jab is around, I will have it, even if it has some side attacks that will still be better than the side effect (death, and an unpleasant one) that might kick in if, unvaccinated, I caught the disease.