There might be a few clues, but be aware that a lot of Long Branch wood originated from Savage or has Savage caps fitted.
If you can distinguish the wood type, then birch or maple are an indication that the forend is Savage or Long Branch. Britishtend to be walnut and beech.
Most Savage forends had the lightening cuts made with a circular saw, unlike the routed grooves on British and Canadianrifles.
The metal cap may have a Canadian "CCM" stamped as the makers code. However quite a few Long Branch forends have the "square S" Savage versions fitted.
Post a few close ups of the forends, and we may be able to indicate the manufacture.