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migration of ltm on GTM unit
It shouldn't have an impact. All of your existing GTM configuration objects (wide IPs, pools, servers) reference content that exists on your "old" LTM pair. Adding "new" LTMs that have virtual servers/pools/nodes named the same will not cause any problems because they aren't referenced in the existing GTM config.
However, I don't know if your cutover will be as simple as you suspect. At least from the GTM's perspective, it knows about all of the virtual servers configured on the "old" LTM. All of your GTM pools reference those objects. When you remove the "old" LTM servers from the GTM config, all of those virtual servers are going to disappear out of your GTM pools.
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