Looking at a comparison between these 2 the S3 might hold more weight but that won’t matter with you:
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www.crutchfield.com
These 2 are basically the same stand.
Yes, this is the case the Solidsteel website comfirms it here:
Hi-Fi Rack for Audio Systems Ennobled MDF wood with Melamine Finish 50 kg of maximum load per each shelf Modular The S2 Series is our basic range of Hi-Fi racks. These traditional models are some of the most appreciated products in our catalogue: a must-have solution for passionates who desire...
solidsteel.it
The S2 holds 50kg weight per shelf and the S3 holds 60kg of weight per shelf.