I bought several VPSes across different VPS providers. Although I chose Ubuntu 20.04 on all providers, I found they use different Linux kernels. There might be other differences as well. In order to keep my running environment stable, I want to use the same OS image in all VPSes. But I think it’s impossible, it seems, that every vendor has some modification on internet options at least.
If they’re VMs, just install the kernel you want - keeping them updated is your responsibility anyways. If they’re containers (Virtuozzo), you’re not gonna change the kernel anyways.