A/B testing is a standard of increasing conversion rates. Sometimes you may want to see how two different PDP templates compare in performance for the same product, but you don't want to create two different products in your Shopify catalog.
Rendering a different template is easy. Use the view
param.
https://yourstore.com/products/cool-shirt?view=other-template-name
You can do the same for other pages also.
https://yourstore.com/pages/my-page?view=other-template-name
Now you can direct traffic to the same PDP, but split to different templates.
# Default template
https://yourstore.com/products/cool-shirt
# Other test template
https://yourstore.com/products/cool-shirt?view=other-template-name
Easy peasy.