I am currently looking into purchasing a bunch of ElasiCache reserved instances.
I know from EC2 and RDS, that it does not matter if you purchase e.g. a t3.medium or 2 t3.small instances, because the reserved instances are size-flexible
Is this also the case for reserved ElasiCache instances?
To answer my own question, the answer is no.
I found this in the Recomendation page: