Possible but sounds a little too high for 'other', at least going by how shipments tend to be somewhere between NA and Japan figures. Shipments aren't everything of course but we'll hear more about them at the end of the month.
Looking at last quarter's LTD shipments, we see the following:
Japan = 1.95M (25.6%)
Americas = 3.11M (40.8%)
Other = 2.56M (33.6%)
Total = 7.63M
It should be noted, of course, that NPD only gives US numbers, so the Americas category cannot be wholly ascribed to the US (i.e. the 4.1M is Japan+US rather than Japan+NA). Using estimates from the first quarter, the Switch had sold 906k in US, while shipments to Americas were 1.20M. Now, we can't take the ratio from that directly, either, since some units would still be in transit, and therefore shipped but not sold to the US. The question is: what percentage of Americas is US? We don't know, so let's try some scenarios that could be true, namely 80%, 85%, and 90%
80%: Japan + US = 25.6 + 0.80*40.8 = 58.24% of total sales -> Total sales in Q4 = 4.1/0.5824 = 7.04M
85%: Japan + US = 25.6 + 0.85*40.8 = 60.28% of total sales -> Total sales in Q4 = 4.1/0.6028 = 6.80M
90%: Japan + US = 25.6 + 0.90*40.8 = 62.32% of total sales -> Total sales in Q4 = 4.1/0.6232 = 6.58M
Some final remarks: the numbers for Japan and US are shipped, not sold. The US had some stock left, but even when Japan doesn't, there could still be some units in transit, meaning that the shipped numbers is higher. This problem also presents itself in the reasoning above: the 7.63M is not sold through, but shipped. Therefore, we had to make the uncertain assumption that sell-through compared to shipments is everywhere approximately equal. We already know this isn't true in Japan, where every unit is sold (almost) as soon as it hits store shelves. So, keep that in mind when reading/using the numbers above.