Flavours of the 350
AS350C was the first with a LTS 101 600A and preceded the B model in being type certified.
AS 350D came after the C with LTS 101 600A2.
AS 350D1 is the same as the D with a LOWER MTOW.
AS350B came along with Arriel 1B engine.
All of the above have "Blue" MR Blades.
AS350BA is a "B" with 355 "Grey" blades and 355 TR blades and a few mods to the transmission deck.
AS350B1 is like a BA except with a Arriel 1D engine and TR compensator and boom strake.
AS350B2 is as above with a Arriel 1D1 and different tailpipe.
AS350B3 is basically a B2 with an Arriel 2 engine (FADEC) VEMD and NO boom strake as it has the TR off a 355N Model.
EC130B4 is EC120 at the front, B3 in the middle except with Dual hydraulics and EC135 in the tail although a mirror image due to direction of rotation.
There is/was a Soloy conversion to install a 250C30. Ones I have seen have some probelms with exhaust re-ingestion and if you look at the installation it is very "draggy" compared to the Lyco or TM.
There is a "Super D" with an LTS 101 750 and effectively B2 running gear.
Some people who have stuck by the Lyco love them. Low fuel burn and the engine can be operated "on condition". You can do a lot on the Lyco yourself. TM are very reluctant to let people outside their organisation mess with their engines.
And there is an odd one out there - AS350BB UK Military training aircraft (HT1) which I think is a BA with a 1D1 in it.