Same motherboard means you are fine.
You have two options:
1) Reinstall Windows, or
2) CLONE from HDD to SSD
Cloning isn't possible if you can't reduce down to under 90GB roughly though (some of the SSD should be overprovisioned).
Other:
*You can also UPGRADE to Windows 10. There's an easier way coming this month, but for now you can do it THIS way:
1. Upgrade W7 to W10 on the hard drive.
2. Shut down, remove hard drive, and attach SSD
3. Boot to W10 install media (explained below), install W10, drivers, programs etc.
*skip any key requests. W10 will activate automatically over the internet if you previously upgraded the same PC.
4. Attach HDD (may need to change BIOS boot order or it might boot from HDD instead of SSD)
5. Copy any files needed to SSD
6. Delete or Format the hard drive (may want to create a temporary folder to move files to... if you have Steam games you'll want to keep the Steamapps folder. Explained below)
Other:
Media Creation Tool:
http://windows.microsoft.com/en-ca/windows-10/media-creation-tool-install
a) Download and run tool
b) choose "other PC" to allow to download the ISO image
c) Burn image to DVD (imgburn) or USB thumb drive (Rufus)
d) Use for CLEAN INSTALL to DVD (or run from Windows to do the in-place upgrade from W7 if normal method fails)
STEAMAPPS:
a) Install Steam to c-drive (if clean install), then
b) create another folder on e-drive (hard drive) from Steam settings->library...
c) MOVE the Steamapps folder that previously existed to the new one on the hard drive
d) Reboot
e) "verify integrity of game cache" for each game before starting.
Summary:
A bit confusing I know, but my advice is to end up with a CLEAN INSTALL of Windows 10 on the SSD.