Difference calculation from same row

[JamTheMod]

Hi all,

I've got a question regarding the possibility, or not, to be able to automaticaly calculate a difference between values of a same row.
Here's an example of what I'm expecting to do:

The data (one unique table):

Month Value Indicator
1 100 toto
1 50 toto
2 120 toto
2 75 toto
3 30 toto
3 36 toto
3 80 toto
...

The report would look like this:

Indicator Month Value Month Value Diff.
Toto 1 150 2 195 +45

Then I'd like to be able to change the months selected and always have the difference calculated.
Is it possible to preset the formula calculation with DAX ?

TIA