Are L-shaped and T-shaped Magsafe 1 interchangeable? I want to buy replacement Magsafe 1 cable for my MBP 17" Late 2011, and they are available in two options — L-shaped and T-shaped. My computer was shipped with L-shaped connector, however I want to swap it for T-shaped, as I find it more convenient.

So, will it fit? Are there current restrictions on T-shaped connectors, e.g. won't they overheat when powering 85W MBP?
In short no, there's no problem.

Apple changed the "old" T-models with new L-models.

However, they are exactly the same and I've been using a 85Watt MagSafe charger for years now as it charges much faster.
Just do it, and nothing will change, except if you go from 45/60 watt to 85 (it will load faster :)). It's just a new look, the connectors are exactly the same.