Agile is new way how to work together in a small team.
SCM is mostly in Forums as this an acronym for Software Configuration Management.
Agile working styles are based on the ideas of developersl, like Scrum.
So in this context view one of the videos about Scrum and be aware SCM is a bigger context than Version Control.
On the other hand SCM can be an acronym for Supply Chain Management.
In this cast the delivery chain from customer to supplier to supplier, to s.... get transformed to agile processes. Therefore for my opinion working friendly together cross company borders and moving to agile work contracts is the hard work.
or possible you have another acronym.
But always starting with the agile manifest, is a good idea, ask if all agree to sign it, if you can stop here.