QUESTION! about the front site! Is it hard to take off the barrel? Do i need special tooks outside of a good vice?

i got the pic from gun broker, but that is pretty much my fathers enfield. If you notice the front site and bayo lug, i believe it is the same one as yours as well. Now i have also found enfields that have a front like this.....

looks competly different. Whats the difference between the two models? And do i need to be aware of that when i buying replacement parts?
Drakin