OK, a bit confused...
Hot water radiant normally refers to tubes embedded in the floor, but you say that you removed a baseboard unit, which makes it sound as if your home has baseboard hot water, which is actually convection heat (but that's beside the point).
Anyway...
There are two ways of hooking up heating units.
The first, which isn't common but which is done in small homes, is in series. That means if you have 3 heating units, hot water flows through the first one, into the second one, then into the third one. By the time the water gets to the third unit, it's a lot cooler than it was when it went through the first one.
The most common way of plumbing a hot water system, though, is in parallel, where there's a hot water supply "main" with branches off to each individual heating unit, with the cooler water returning to the boiler either through a dedicated return main or, sometimes, through the same loop (the problem with that is similar to hooking them up in series in which the radiators nearest the boiler get the hottest).
If your system is hooked up in parallel, then it doesn't matter what the restriction is on your toekick heater, because it won't restrict flow through the main.
This page has diagrams that show the common ways of plumbing hot water systems.
https://www.diydata.com/planning/central_heating/pipework.php