Can I just solder an SMD part directly on the through holes of the PCB?
The pitch of SMD matches the pitch of the through holes.
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For DIY project, no problem.
If you manufactured a large quantity then you'd have to care about having a low number of defects which means taking care of all the details. But for one-off DIY projects, yolo.
Unless there's something you're not saying, like the SMD part is a power transistor or LDO that needs a copper plane for heat sinking, stuff like that.