It is not same shard you are getting t3 shards and t2a shards, t2a are harder to come by by far
You get 500 t3 from am milestones 16 is final milestone for that, t2a is transitioning in simple as that your getting double rewards on 16, before the changes were moved to daily completion which has actually made rewards more accessible you got more rewards there
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Milestone 17 is less, Same shard otherwise.
You get 500 t3 from am milestones 16 is final milestone for that, t2a is transitioning in simple as that your getting double rewards on 16, before the changes were moved to daily completion which has actually made rewards more accessible you got more rewards there