Hey Reeva,
Pursuing MSc in Management now will not affect your decision of doing a MBA later in your life. However, both MSc in Management and MBA are general management courses and the difference is
1) MBA is for experienced professional and MiM is for recent graduates.
2) Average course for MBA is 1-2 years whereas in MiM its last up to 10 months-2 years.
3) MBA graduates picked up for mid-level and senior level managerial position and where is MiM for associate or analyst position
4) MBA concentrate on leadership & facilitate communication skills and whereas MiM concentrates on the foundation of a managerial program
5) Tuition fees for MBA are very high compared to MiM.
I would suggest that you do an MSc in Management and look for an MBA or an Executive MBA after you have had at least 5 years of experience in a managerial post to get the full benefit of the program.
For an In-depth difference in between MiM vs MBA visit our blog here:
https://www.mim-essay.com/mba-vs-mim/