I can confirm that, at least at my home, 452.125 MHz isn't simulcasting 155.340 MHZ.
(Though there may still be a very low power simulcast within, or near, the hospital.)
Here's an image of my desktop running two instances of SDRSharp.
The image on the left shows that while 155.340 is active, nothing is received on 452.125.
By the way, the other big signal in the waterfall to the left (in red) is 155.250 MHz Chenango County Sheriff.