Yes it is absolutely possible to get similar results with searxng to start page, in fact some instances allow you to aggregate startpage results directly.
I found priv.au as an example of an instance that can directly aggregate startpage.
So the trick to the instance weirdness going on is that each instance has its own set of default engines set to aggregate from. For example one searxng instance may want to only aggregate google and bing, while another may want to aggregate only independent search engines that don’t use google or bing such as YaCy and Qwant. I’ve visited some instances that give like 2 results because they only aggregate Wikipedia by default lol.
Each result searxng/searxng gives you will show which engine it aggregated that result from, its in the bottom right corner of each result in small text try to look for them to better understand the sources the instance is pulling from.
Here’s what you can do about that: The secret to overcoming this and dialing in the search results you want is to realize you can actually configure each searxng instance to aggregate the engines you want while disabling the default ones you don’t. All searxng/searxng instances have a preferences menu usually a gear icon in the top right corner. Or you can go to searxng-example.com/preferences . Once in preferences go to the ‘engines’ section from there you can tick the engines you want to use.
Some instances save your settings as cookies, some instances save your settings as a sub URL for that instance. The priv.au instance I mentioned saves your settings as cookies.
The best way to use searx is to play with different instances, find one that works pretty well by default then fine tune it. Hope this helps.