In terms of geometry are similar but not the same.
Also DT350 weights around 360
DT240 EXP weights around 310
And this hubset weights around 320, so in terms of weight they are more similar to DT 240 (internals are quite equal in 240 and 350).
About bearings, freehub are different, compatible but Goldix freehub uses 6802 bearings and DT 6902 bearings (in old ratchet). Comparing with DT 240 EXP, this are a bit better, it uses 1526 (15 x 26 x 7 mm) bearings, so bigger ball race than 6802, so we assume that they have longer life.
In terms of bearings lasting 6902 > 1526 (15 x 26 x 7 mm) > 6802... theoretically.
Just a note: Goldix front hub uses 6902 and I think that it could be enough to use 6802 in this case and this will save some grams.
DT240 EXP front hub 24 holes center lock -> 104 grams
Goldix GDR310 front hub 24 holes center lock -> 113 grams
DT240 EXP rear hub 24 holes center lock -> between 204-210
Goldix GDR310 rear hub 24 holes centerl lock -> 206 grams