All I can say is: My A109E type conversion technical notes "workbook" (written by the Agusta factory training center) state:
Blades are made of composite: the blade consists of a 'D' shaped composite spar and the trailing edge is made of nomex core and carbon fibre skins. Blade aerofoils at the root are of the high lift type (AG8021).
Blade airfoils at the tip are of the high velocity type (AG8026).
The leading edge is protected against wear by a bonded stainless steel abrasion strip. Each blade has a bendable trailing edge trim tab adjustable for rotor dynamic tracking. The blades are designed with a "droop snoot" airfoil section and the thickness is tapered from rotor (root*) to tip to optimize the lift coefficient, the blade pitch range and to reduce noise level.
The composite main rotor blades due to the static balancing of each blade to a master blade as a final manufacturing process, they are completely interchangeable.
*root - my edit. Everything else copied verbatim.
Other A109 models are different.