There are some cosmetic UX differences between the sequential blocks and their corresponding nodes (img attached).

Sequential Circle:
To match the block, the node should:
- Move Radius to the bottom
- Move Index / Count to the top

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Sequential Line:
To match the block, the node should:
- Move Line to the bottom

To match the node, the block should:
- Convert the Start / End to a Line input

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Sequential 3D:
To match the other blocks, the block should:
- Move Count X, Count Y, and Count Z on top, right under Index
- Axis X, Axis Y, and Axis Z should be spaceable

To match the other blocks, the node should:
- Move Index, Count X, Count Y, and Count Z on top

To be consistent, both should have the same name.
(I'm partial to Sequential 3D, but either should work, as long as the node and the block have the same name)

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Bonus:
Not sure if it's trivial to have a bool toggling an optional extra output (for target position), but it would make the nodes significantly more powerful.