Devices memory limits. Simulator

I know there were alot of questions about the limits, but again. 

For example 2 devices: Forerunner 945 and Fenix 6 

The first has 

<app id="watch-app" memory_limit="1310720" />

Meanwhile the second only

<app id="watch-app" memory_limit="131072" />

So it's 10 times less. Is this true? or it's just a missprint/bug?

I'm just wondering how it's possible to work with maps with these limits.

Thanks.