There are no risks. Only subtle tonal changes...maybe.
Keep in mind the 16uf caps from days of old had tolerances or 20% or more, in fact +80/-20% was a common spec. So a 16uf cap can easily measure 20ufs and be in spec. You need to MEASURE the old caps to see what their actual capacitance was.
50 years ago 16uf might have been common, but it has not been a standard value in many years. 22uf is a standard value. That is why 22uf is what you see in more recent products and in rebuilds.
Tolerances on all the parts were much looser back then.