/u/johnmu on Does Google care if I have multiple urls for the same post? (opens in new tab)

It's fine, but you're making it harder on yourself (Google will pick one to keep, but you might have preferences). There's no penalty or ranking demotion if you have multiple URLs going to the same content, almost all sites have it in variations. A lot of technical SEO is basically search-engine whispering, being consistent with hints, and monitoring to see that they get picked up.