Unless the proxies are complete shit, there's no reason you shouldn't be able to do both just fine. By the sounds of it, you want to use the proxies with 1 tool on LinkedIn, and then use them with another tool for something unrelated. That should not present any problems at all, and you should probably be able to do both at the same time as well. I've used the same proxies for literally 4 or 5 different things before, as long as you're talking about using them with different sites/services, there's no reason they would conflict with each other. At worst, if they're weak proxies, you might be able to only do 1 thing at a time, but you definitely wouldn't need a different proxy list for each thing unless they didn't work to begin with for some reason. Hope that helps clear it up a bit for ya.