I had almost the same situation where I worked on tele on a day shift and moved to ICU and got a night shift. But this was my choice and I moved to ICU because I always wanted to work in critical care. Likeness to an unit depends on:
:What is the reason you want to move?
I wanted to work in ICU because I love knowing and assessing my patients in detail. I like taking care of them head to toe. I like critical thinking , inferring lab values, PH, looking at the scans and sitting with the family and talking to them.(that happens in some other specialties too).
But I know nurses who have left ICU for the following reasons
1."Its depressing"(termed by some people), because on tele you are sending people home, they are happy(most of time) , ICU you see more deaths and more terminal diagnosis, palliative care, calling the chaplain , family crying on your shoulders and much more.Some nurses were not able to handle the trauma.
2.Physical turmoil(its almost everywhere) , in ICU you are repositioning pts. much more often than on other floors. Most of the time they don't provide techs in ICU so the bed is your best friend.
3.Usually old and established ICUs have older and experienced nurses who have "been there done that ". I have always heard from other floors that ICU nurses have attitude, so sometimes its very hard for a new nurse to get "clicked", I know some nurses who have left because of this reason.
4."I will have only 2 patients", Yes some people move because the no. of patients is less. My fellow ICU nurses can vouch for that sometimes we had 2-3 nurses for one sick pt. Sometimes those two patients are more than 6-7 pts.
5.Critical care training. When I had to move to ICU , I had to take a critical care course . Many hospitals don't do that they just put them on orientation. Physicians rely a lot on ICU nurses and I you have to know what you are doing because you are dealing with the sickest of sickest. Some nurses felt like they were always catching up/couldn't keep up with(not their fault, lack of training).