'Dechlorinator' and 'Conditioner' are largely the same thing, but you will always need to read the bottle to establish exactly what each product does.
Some products will
only 'dechlorninate' which is removing chlorine, chloramine, and metal toxins. Then some products will dechlorinate
and 'condition' the water. Conditioning is where the product you are using will provide other benefits such as: 'replenish protective slime coat', 'contains aloe vera' or 'contains a binder which renders ammonia, nitrite, and nitrate non-toxic.'
You may as well buy a product that is a dechlorinator and conditioner in one, rather than two separate products which give the same results.
There are good brands of dechlorinators/conditioners which will do both, such as
Seachem. Prime OR
AquaSafe Aquarium Dechlorinator Conditioner | Tetra Aquarium
You can see that Prime and Tetra AquaSafe both dechlorinate, but 'condition' in their own way.
Prime not only removes chlorine, chloramine, and metal toxins, but also provides: 'production and regeneration of the natural slime coat', and 'contains a binder which renders ammonia, nitrite, and nitrate non-toxic (for up to 48 hours)'.
Tetra AquaSafe not only remove chlorine, chloramine, and metal toxins, but also provides:
'stress-reducing vitamins, and compounds that inhibit bacteria and fungi', and 'Contains colloids that coat the fish, protecting them against infection'.
So you always want to read each bottle and check whether the features/benefits of that product are what you are looking for. Some users have reported that Aloe Vera has caused skin problems for their Axolotls, so you could avoid any dechlorinator/conditioner that provides that.
I have used Tetra AquaSafe, and Seachem Prime with no issue, as have a lot of users on the forum.