Yes, you can script the configuration of a database and reuse the script.

Note: You need to (a) understand this is an advanced technique and (b) be familiar / fluent in using Python to set values for different types of data structures. Configuration options can be represented in different ways - check boxes, radio buttons, fields to enter text, fields to enter numbers, fields to select dates, fields to select related records, etc. - which translate to model fields of different types: boolean, selection, char, integer, date, many2one, etc. - and each needs a different method to set and/or change the value.

We do this in our test scripts, so you can also do it in your own scripts.  (Please test and verify what you think is happening is actually happening!).

In the code at https://github.com/odoo/odoo/blob/14.0/addons/base_setup/tests/test_res_config.py#L40 you can see these lines configure a database to support multiple currencies (res.config.settings is a transient model):

# get access to the configuration model
ResConfig = self.env['res.config.settings']

# get a copy of the default values
default_values = ResConfig.default_get(list(ResConfig.fields_get()))

# update the default values
default_values.update({'group_multi_currency': True})

# persist the updated defaults
ResConfig.create(default_values).execute()

Example:

Let's say we want to change the default currency of a database to $USD and also configure the database to support multi-currency, and the current configuration looks like this:

First, hover over each of the fields to see their technical name, since these are the fields you will need to update:

Next, you can script.  This example uses a Scheduled Action configured as inactive so the only time it runs is when the RUN MANUALLY button is clicked.  You may prefer to write an XML-RPC based script. 

default_values = model.default_get(list(model.fields_get()))

default_values.update({
  'currency_id': env.ref('base.USD').id,
  'group_multi_currency': True
})

model.create(default_values).execute()

After the script is run:

You can also use the function capability of XML files to install modules:

<odoo>

<!-- Install an App -->
<function
  model="ir.module.module"
  name="button_install">
  <function
    model="ir.module.module"
    name="search"
    eval="[[('name','in',['stock','purchase'])]]"/>
</function>

</odoo>

See https://www.odoo.com/documentation/14.0/reference/data.html?highlight=function#function