All Jetrangers count as one variant, all Longrangers count as one variant EACH.
Meaning if you get your first type rating on a Jetranger and want to fly all Longrangers you need 4 more flight hours with Instructor (L, L1, L3, L4)
JAR–FCL 2.235 Type ratings – Privileges,
number and variants
[ ]
(a) Privileges. Subject to JAR-FCL 2.220[
][(a)] above, the privileges of the holder of a type
rating are to act as a pilot on the type of aircraft
specified in the rating.
(b)...
(c) Variants. If the variant has not been flown
within a period of 2 years following the differences
training, further differences training or a
proficiency check in that variant will be required.
(1) Differences training requires
additional knowledge and training on an
appropriate training device or helicopter. The
differences training shall be
entered in the
pilot’s logbook or equivalent document and
signed by a TRI/SFI(H) or FI(H) as appropriate.
(2) Familiarisation training requires the
acquisition of additional knowledge.
This differences training shall be entered in the
pilot’s logbook or equivalent document and signed
by a TRI/SFI(H) or FI(H) as appropriate.