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The lantana you're looking for may be Pink Caprice. Perhaps you can find seeds for this variety and start them yourself. Here's an article that may be helpful:
https://www.gardeningknowhow.com/ornamental/flowers/lantana/how-to-propagate-lantana.htm

https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm

It sounds like the more vigorous purple variety overcompeted with the yellow variety and killed it off. You will have to completely remove the purple and replace it with yellow again.

Lantana is a beautiful plant that attracts butterflies and hummingbirds. Not sure if you are planting in the ground or in a container. If in the ground, it should only be as deep as it was in the pot. In other words, when you pull it out of the pot, the top of it should be level with the ground when planted. Just tamp it down lightly. Do not pack it in.

The larger the container, the more space the plant has to grow roots and the less often it will need to be watered. Make sure there is at least 6 or 8 inches of soil in the bottom of the pot. Use a light potting soil and water in.

In a container, water as often as the top 1 inch of soil dries out. That could be once or twice a day during the hottest times of the year. If in the ground, also check the soil for moisture level till you learn about how long you can go between waterings. If it is wilting, you are waiting too long.

Adding mulch to the soil can help conserve water.

Here is more information:

https://www.gardeningknowhow.com/ornamental/flowers/lantana/watering-lantana-plants.htm

There are several wild species of lantana and some have thorns. Lantana urticoides is native to Texas, Arizona and New Mexico and sometimes has prickles.

That can help, some. They aren't heavy feeders, but sometimes there is too much nitrogen in the soil for flowering. This can be offset by adding bonemeal.

Here is an article that will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

Here is an article that will help you with the care of Lantana:

https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm

This is a fungal infection from soils that do not get a chance to dry out thoroughly between watering, or soils that are too compact and remain saturated under the surface.

Fungicides will be in order:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

Next, adding earthworms will be beneficial to breaking up compact soils, and adding nutrients back to the area.

Here are some articles that will help:

https://www.gardeningknowhow.com/composting/vermicomposting/worm-castings.htm

https://www.gardeningknowhow.com/composting/vermicomposting/worm-composting-bins.htm

https://www.gardeningknowhow.com/composting/vermicomposting/benefits-of-garden-worms.htm

https://www.gardeningknowhow.com/composting/vermicomposting/creating-worm-beds-in-gardens.htm