Ah, it’s you ttakata73 
I’d say both will not work…
either a bit faster with less comfort - Hookworm -
or (very close) to the speed before, but more comfort - Big Apple - …
However…
Please take also a look at this post for the wide tire mounting issue.
Problem with Big Apple 16"
The diameter difference of 18 x 1,35" to 16 x 2,00" is nearby 2 cm (42,7 - 40,7).
Diameter of Hookworm and Big Apple are in fact almost identical,
the fatter look of the Hookworms is caused by profile depth and shape.
The largest possible 16 inch tire size will be 16 x 2,125" (57 - 305),
this would add about 0,125" (= 3,175 mm).
Schwalbe Mad Mike 57-305
I guess these should fit, but didn’t check that so far…
Big Apple (front/lower) vs Hookworm:
Schwalbe Big Apple compared to Kenda Kwest 16 x 1,5", both on original rims:
