I would like to ask if there are any differences between the latest version of the threshold scheme and the previous one

The Threshold FHE version in v1.1 allows parties (minority) to drop out before the distributed decryption. This is done by running an extra round after keygen where each party secret shares their secret (using shamir or additive sharing) to other parties. The parties can then use these secret shares to recover the decryption share of the dropped out parties during distributed decryption. This is implemented at the cryptocontext level and is available for all schemes - BGV/BFV/CKKS. A small 2-out-of-3 example to use the functions can be found in the unit test function ‘UnitTestMultipartyAborts’ in src/pke/unittest/UnitTestMultiparty.cpp. Linking a related question here.