```sh
$ cat hoge.py
from docopt import docopt

__doc__ = """Can docopt allow the sme name argument differ single/multiple between subcommands?

Usage:
  hoge.py a <arg>
  hoge.py b <arg>...
"""

args = docopt(__doc__)

print('subcommand: %s' % ('a' if args['a'] else 'b' if args['b'] else None))
print('<arg> = %s' % repr(args['<arg>']))
```

```sh
$ python3 hoge.py a
Usage:
  hoge.py a <arg>
  hoge.py b <arg>...
$ python3 hoge.py a 1
subcommand: a
<arg> = ['1']
$ python3 hoge.py a 1 2
Usage:
  hoge.py a <arg>
  hoge.py b <arg>...
$ python3 hoge.py b
Usage:
  hoge.py a <arg>
  hoge.py b <arg>...
$ python3 hoge.py b 1
subcommand: b
<arg> = ['1']
$ python3 hoge.py b 1 2
subcommand: b
<arg> = ['1', '2']
```