Your description effectively conveys a powerful visual metaphor comparing India and Japan's economies through the imagery of two boats. Here's a rewritten summary in your own words that captures the core idea clearly and concisely:

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In the cartoon, two boats represent India and Japan, both labeled with “4 Trillion USD” to show they have similar GDPs.

The Indian boat is a large, overcrowded wooden vessel, packed with many people, some rowing, others just sitting. It flies the Indian flag, symbolizing India’s vast population. The boat looks heavy and difficult to move.

The Japanese boat is smaller, sleek, and motor-powered, with only a few people — a man steering, and a few women and children. The Japanese flag is at the back, symbolizing Japan’s smaller population. This boat seems to glide forward easily.

The message, “Same GDP, different load,” highlights how population size affects the burden on each citizen. Even with the same economic output, India’s massive population makes progress harder, while Japan, with fewer people, can move ahead more smoothly and efficiently.

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Let me know if you'd like this phrased more formally or informally, or translated into Urdu.