The two will spend the rest of the season with All Stars in the first division after battling for game time with Swallows.
Shwabule, who plays as a left-back, has managed just two appearances this season with Sifiso Hlanti, Thabo Matlaba and Keegan Ritchie all ahead of him in the pecking order.
Ndlovu has also battled to break into the Dube Birds' first team setup this season.
Meanwhile, Benin international goalkeeper Marcel Souke Dandjinou has signed for JDR Stars following a successful assessment with the promotion-chasing first division club.
Dandjinou's deal will run up to the end of the season, with a further two-year option to extend.
The 22-year-old played for ESAE FC in the Benin Premier League and has the experience of playing in the CAF Confederations Cup.
He becomes the second West African goalkeeper at JDR Stars, who already have Ivorian international Badra Ali Sangare.
Dandjinou is currently in the Benin national team as back up to veteran keeper Fabien Ceddy Farnolle.