Yes, both your Diploma in Engineering (regular) and IGNOU graduation (distance) will likely be valid. Here's why:

• Distance Education Regulations: The UGC permits pursuing a graduation program through distance education (like IGNOU) while enrolled in a regular diploma program.

• No Time Overlap: Since your diploma is regular mode and IGNOU is distance mode, there's no clash in attending classes, making it manageable.

However, a couple of points to consider:

• University/Institute Rules: Double-check if your diploma program's university or institute has any specific regulations regarding pursuing another program simultaneously.

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• Time Management: Balancing a regular diploma and a distance graduation program requires good time management skills.

If you're unsure about your diploma program's rules, it's best to contact their administration for clarification.  Overall, both degrees should be valid as long as they are from recognized institutions.

hope this helps you!!