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The Smith and Wesson model 27-2 denotes that there was a second engineering change to the original model 27.The second change indicates that Smith and Wesson changed the cylinder stop,and eliminated the trigger guard screw.
This is as job best left to a factory trained individual. If you do it yourself, you might void the warranty.
On some guns you can change out the trigger springs, others you may have to buy a new trigger or trigger assembly.
Yes, they are both N frame 357 magnums. The -2 denotes an engineering change -2 1961 Cylinder stop changed, hole in front of trigger guard eliminated
Best left to a gunmsith.
It turns it into a B flat horn, the fingerings change when you hold down the trigger.
You let a trained gunsmith do it.
With the brief description that you have supplied,I would say that you have a SMith and Wesson model of 1905 4th change revolver.
The Smith and Wesson model 18-2 had the cylinder stop changed,and the trigger guard screw deleted,The model 18-3 had the relocation of the rear sight leaf screw,and the model 18-4 change was the gas ring was moved from the yoke to the cylinder.The model 18-2 change was done in 1962,the model 18-3 in 1967,and the model 18-4 in 1977.
Heat
The smith and wesson model 15,4th change (15-4) was made by smith and wesson in 1977.
An engineering change.