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You can grow plants with different growth rates, but make sure they all get enough light
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If you notice one plant growing slower than the rest, make sure it gets direct light by trimming the bigger plants if they're casting shadows.
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You can also use support sticks to keep the largest plants in place (paste the link to it here).
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If a plant doesn't get enough light, it will grow very slowly, as plants depend on light to photosynthesize. Remember that the plant light should be about 4 inches (10-12 cm) above the plants.
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The speed of plant growth also depends on temperature - the warmer, the better
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The optimal temperature is 20-25°C, and anything above 20-21°C is great! If it's below 19°C, the plants will grow very slowly.