If I have the ID#.... I use a "bookmark" on my browser-bar that jumps to my own WikiTree profile with a click.
Once there I go to the address bar and replace "Hathaway-1200" with the other ID# and click to go.
You can also find any of your profiles in your Watch-List.
The "people search" feature is very helpful as well.
You can always go to Find | People: Search. Second box from the bottom is search by Wiki ID.
There's one little box near the bottom that says ID: next to it. If you put the WikiTree ID in and hit the GO button above it, it will find the associated profile.