Short answer: no.
Longer answer: As you knew, you were correct to suspect renumbering when finding what appears to be an incorrect number on a stamp from an old source. Revcollector is correct, 1940 is the pivotal year for much of the current numbering system. Looking back, this portion of Scott was essentially current in 1925:
Scott Standard Postage Stamp Catalog, 1925, page 20 (All the world in one tiny volume!):
I do not have a 1924 Scott catalog, but the 1923 Scott, pages 13-14 shows the previous iteration of the numbering for this area (looks like our modern 343 was then 323a):
And back to the 1915 Scott, pages 12-13, essentially the same. Note the recognition of the blue papers even back then as sub-varieties.